Percentage of patients 18 years of age and older who obtained at least a 10% improvement in hip pain and/or function as measured by validated patient-reported outcome measures (PROMs) completed up to 90 days prior to and 9 to 15 months after undergoing primary total hip arthroplasty (THA) surgery. PROMs include any validated measures of hip-related pain and/or function, such as HOOS-Pain, HOOS-ADL, HOOS-PS, and HOOS-JR.